Aluminum Extrusion Heat Sink Profile High Density Anodized Heatsink

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Anodized Heatsink

Heatsinks play an important role in cooling electronic and mechanical devices. They act as passive heat exchangers, transferring heat from the hot components to a fluid medium.

There are many different types of heat sinks. Some heatsinks are made from copper and some are made from aluminum. But, most commonly, heat sinks are made through the process of aluminum extrusion. And these extruded heat sinks are also commonly anodized.

What is the Anodizing Process?

The most common method of surface finish in electronics cooling is the surface anodizing. Anodizing is an environmentally safe electrochemical process, that unlike painting or powder coating, there is nothing applied to the aluminum heat sink's surface. Instead, anodizing thickens and toughens the naturally occurring protective oxide layer on the surface of metal parts. Anodizing can changes the microscopic texture of the metal, making the surface durable, corrosion and weather resistant.

How does the anodizing process work?

Your aluminum extrusions heatsinks are placed in an electrolytic bath.

In the process, the extrusion heat sink metal forms the anode (the positive electrode) of an electrolytic circuit. By an acidic electrolytic solution, the electrical current releases hydrogen at the cathode (the negative electrode) and oxygen at the surface of the heat sink metal anode (the positive electrode), building up a deposit of metal oxide. The acid action is balanced with the oxidation rate to form a coating with some microscopic pores, 10-150 nm in diameter. The thickness of the heat sink metal oxide depends on the anodizing method and is between 0.5 and 115 microns. It is controlled by electrolyte concentration, acidity, temperature, and the process electrical current and voltage.

What are the Benefits of Anodized Heat Sink?

1. Improved Corrosion Resistance( The acetic salt spray test of ISO 9227 expects anodized aluminum to show no pitting after 24 hours)

2. Improved Wear Resistance ( Especially hard anodizing)

3. Increased Electrical Isolation ( Breakdown voltage varies from a few to several hundred volts, depending on the alloy and on the nature and thickness of the film)

4. Increased Surface emissivity ( Higher radiation effect in natural convection)

5. Improved Decorative appearance / colors

Anodizing improves corrosion resistance, wear resistance, and electrical isolation, because of the thickness of the oxide layer.

Does Anodizing Color Affect Heat Sink Performance?

Anodized heat sink can be dyed in colors like black, blue, green, and so on. It is important to note, however, that the only real impact of color is a visual one. Regardless of the color, heat transfer will not be affected. The clear anodized surface has the same emission characteristics as the black anodized surface. The main benefit of these dyes is their visual appeal.

It's also important to note that you should never paint or powder coat heat sink. These coatings will act as an insulator. They will negatively impact heat transfer.

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